How do you detect house fire??

Alarms and detectors. The first sign you might have if there is a fire elsewhere in the building is a fire alarm or detector going off. ...
Smoke. An obvious sign of fire is smoke – as the old adage goes: “there's no smoke without fire”. ...
Smell. ...
Loud noises. ...
Hot door and door handle.

Maybe if you put away all your electronics and lock them with a key and give the key to some one you trust like your parents for about a month to stop the process

If it's a smaller child or infant, place one on the middle of the chest and on the child's back. (if it is a bigger child with enough room for two, place one on the upper right/your left of the chest, and one on the lower left/your right) the pads should never touch each other.